Chlorastrolite and Blue John Physical Properties

Chlorastrolite and Blue John Chemical Formula

While comparing Chlorastrolite and Blue John physical properties, the important data you should know is its chemical composition. Since chemical formula defines the molecular structure of the crystal, most of the physical properties like color, tenacity, solubility are governed by Chlorastrolite and Blue John chemical formula.

• Chemical formula of Chlorastrolite- Ca 2(Mg,Fe)Al 2(SiO 4)(Si 2O 7)(OH) 2 · H 2O)Arthur Thomas , Gemstones (2009)
• Chemical formula of Blue John- CaF 2Michael O’Donoghue , Gems, Sixth Edition (2006)

Chlorastrolite and Blue John Specific Gravity

Another important criteria for qualitative analysis of gemstones is Chlorastrolite and Blue John Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Chlorastrolite and Blue John Optical Properties during the identification of gemstone. Specific gravity of Chlorastrolite is 3.00-3.25 whereas that of Blue John is 3.00-3.25.